util-vserver-0.30.208

[util-vserver.git] / lib / getprocentry-legacy.c

diff --git a/lib/getprocentry-legacy.c b/lib/getprocentry-legacy.c
new file mode 100644 (file)
index 0000000..747a4dd
--- /dev/null
+++ b/lib/getprocentry-legacy.c
@@ -0,0 +1,84 @@
+// $Id: getprocentry-legacy.c,v 1.4 2004/03/05 04:40:59 ensc Exp $    --*- c++ -*--
+
+// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//  
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//  
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "utils-legacy.h"
+#include "internal.h"
+#include "vserver-internal.h"
+
+#include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+static volatile size_t         proc_bufsize = 4097;
+
+size_t
+utilvserver_getProcEntryBufsize()
+{
+  return proc_bufsize;
+}
+
+char *
+utilvserver_getProcEntry(pid_t pid,
+                        char *str,
+                        char *buf, size_t bufsize)
+{
+  char                 status_name[ sizeof("/proc//status") + sizeof(unsigned int)*3 + 1 ];
+  int                  fd;
+  size_t               len;
+  char *               res = 0;
+
+  if (pid<0 || (uint32_t)(pid)>99999) {
+    errno = EBADR;
+    return 0;
+  }
+
+  if (pid==0) strcpy(status_name, "/proc/self/status");
+  else {
+    strcpy(status_name, "/proc/");
+    len = utilvserver_fmt_uint(status_name+sizeof("/proc/")-1, pid);
+    strcpy(status_name+sizeof("/proc/")+len-1, "/status");
+  }
+
+  fd = open(status_name, O_RDONLY);
+  if (fd==-1) return 0;
+
+  len = read(fd, buf, bufsize);
+  close(fd);
+
+  if (len<bufsize) {
+    buf[len] = '\0';
+    if (str)
+      res    = strstr(buf, str) + strlen(str);
+    else
+      res    = buf;
+  }
+  else if (len!=(size_t)-1) {
+    if (proc_bufsize==bufsize)
+      proc_bufsize = bufsize * 2 - 1;
+
+    errno = EAGAIN;
+  }
+
+  return res;
+}